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Date:         Thu, 27 May 2010 22:14:47 -0400
Reply-To:     Dennis Haynes <d23haynes57@HOTMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Dennis Haynes <d23haynes57@HOTMAIL.COM>
Subject:      Re: Digifant timing/tuning help needed
Comments: To: Greg Potts <greg@POTTSFAMILY.CA>
In-Reply-To:  <4BFEE5A5.40608@pottsfamily.ca>
Content-Type: text/plain; charset="us-ascii"

On the Digifant, the ECU has absolutely nothing to do with spark advance. Problem is in the distributor. The distributor has mechanical (centrifugal), advance, and vacuum advance and retard.

Dennis

-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Greg Potts Sent: Thursday, May 27, 2010 5:36 PM To: vanagon@GERRY.VANAGON.COM Subject: Digifant timing/tuning help needed

Hi Volks,

My 1.9L digifant engine has been sluggish ever since I put it into the bus back in September. It doesn't seem to make much power unless I wind it out to 2.5K rpm or so. Fuel economy is nothing great either; I am only getting 14MPG on a typical tank.

Compression is good. (Around 150 on all 4 cylinders last time I checked) Distributor is only 1 year old, as are wires, cap, rotor and plugs. If I pull a plug wire off the distributor the idle staggers no matter which plug wire I remove (ie, no weak link).

Coolant temp sensor was replaced, it didn't help. O2 sensor is disconnected until I get a new one; It's pretty much undriveable with the O2 sensor connected. Throttle position sensor is working.

So tonight I checked the timing. 5 degrees BTDC at 2K RPM with coolant sensor disconnected. It's spot on at 2K rpm but as the revs increase the timing stays rock steady at 5 degrees BTDC.

According to http://www.oldvolkshome.com/ignition.htm the timing should advance to 35 BTDC at 3K RPM....

I have tried swapping the ECU and AFM with good spare parts and it makes no difference whatsoever.

Am I doing something wrong, is the ECU broken or am I reading more into the oldvolkshome specs than I should?

Happy Trails,

Greg Potts Toronto, Ontario Canada 197x Westfakia "Bob the Tomato" 1987 Wolfsburg Weekender Hardtop www.pottsfamily.ca

BUSES OF THE CORN - AUGUST 13-15th, 2010 www.pottsfamily.ca\busesofthecorn


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